import pygame


class Ship:
    """管理飞船的类"""

    def __init__(self, ai_game):
        """初始化飞船并设置其初始位置"""
        # 获取游戏屏幕
        self.screen = ai_game.screen
        # 获取游戏屏幕的矩形
        self.screen_rect = ai_game.screen.get_rect()
        # 获取游戏设置
        self.settings = ai_game.settings

        """加载飞船图形并获取其外接矩形"""
        self.image = pygame.image.load("images/ship.png")
        self.image = pygame.transform.scale(self.image, (30, 40))
        # 获取飞船图片的矩形
        self.rect = self.image.get_rect()

        """对于每艘新飞船，都将其放在屏幕底部的中央"""
        self.rect.midbottom = self.screen_rect.midbottom

        # 在飞船属性的x中存储小数值
        self.x = float(self.rect.x)

        # 移动标志
        self.moving_right = False
        self.moving_left = False

    def update(self):
        """根据移动标志调整飞船的位置"""
        # 设置标志位和移动边界
        if self.moving_right and self.rect.right < self.screen_rect.right:
            # self.rect.x += 1
            self.x += self.settings.ship_speed
        if self.moving_left and self.rect.left > 0:
            # self.rect.x -= 1
            self.x -= self.settings.ship_speed

        # 根据self.x更新rect对象
        self.rect.x = self.x

    def blitme(self):
        """在指定位置绘制飞船"""
        self.screen.blit(self.image, self.rect)
